Grill brush



FIG. 1 is a right side elevational view of a grill brush showing our new design, the left side being a mirror image;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a rear elevational view thereof.

The broken lines shown in the figures of the drawings represent a handle that forms no part of the claimed design. 

CLAIM The ornamental design for a grill brush, as shown and described. 